[linux-2.6-block.git] / drivers / cpufreq / Kconfig

menu "CPU Frequency scaling"

config CPU_FREQ
	bool "CPU Frequency scaling"
	select SRCU
	help
	  CPU Frequency scaling allows you to change the clock speed of 
	  CPUs on the fly. This is a nice method to save power, because 
	  the lower the CPU clock speed, the less power the CPU consumes.

	  Note that this driver doesn't automatically change the CPU
	  clock speed, you need to either enable a dynamic cpufreq governor
	  (see below) after boot, or use a userspace tool.

	  For details, take a look at <file:Documentation/cpu-freq>.

	  If in doubt, say N.

if CPU_FREQ

config CPU_FREQ_GOV_COMMON
	bool

config CPU_FREQ_BOOST_SW
	bool
	depends on THERMAL

config CPU_FREQ_STAT
	tristate "CPU frequency translation statistics"
	default y
	help
	  This driver exports CPU frequency statistics information through sysfs
	  file system.

	  To compile this driver as a module, choose M here: the
	  module will be called cpufreq_stats.

	  If in doubt, say N.

config CPU_FREQ_STAT_DETAILS
	bool "CPU frequency translation statistics details"
	depends on CPU_FREQ_STAT
	help
	  This will show detail CPU frequency translation table in sysfs file
	  system.

	  If in doubt, say N.

choice
	prompt "Default CPUFreq governor"
	default CPU_FREQ_DEFAULT_GOV_USERSPACE if ARM_SA1100_CPUFREQ || ARM_SA1110_CPUFREQ
	default CPU_FREQ_DEFAULT_GOV_PERFORMANCE
	help
	  This option sets which CPUFreq governor shall be loaded at
	  startup. If in doubt, select 'performance'.

config CPU_FREQ_DEFAULT_GOV_PERFORMANCE
	bool "performance"
	select CPU_FREQ_GOV_PERFORMANCE
	help
	  Use the CPUFreq governor 'performance' as default. This sets
	  the frequency statically to the highest frequency supported by
	  the CPU.

config CPU_FREQ_DEFAULT_GOV_POWERSAVE
	bool "powersave"
	select CPU_FREQ_GOV_POWERSAVE
	help
	  Use the CPUFreq governor 'powersave' as default. This sets
	  the frequency statically to the lowest frequency supported by
	  the CPU.

config CPU_FREQ_DEFAULT_GOV_USERSPACE
	bool "userspace"
	select CPU_FREQ_GOV_USERSPACE
	help
	  Use the CPUFreq governor 'userspace' as default. This allows
	  you to set the CPU frequency manually or when a userspace 
	  program shall be able to set the CPU dynamically without having
	  to enable the userspace governor manually.

config CPU_FREQ_DEFAULT_GOV_ONDEMAND
	bool "ondemand"
	select CPU_FREQ_GOV_ONDEMAND
	select CPU_FREQ_GOV_PERFORMANCE
	help
	  Use the CPUFreq governor 'ondemand' as default. This allows
	  you to get a full dynamic frequency capable system by simply
	  loading your cpufreq low-level hardware driver.
	  Be aware that not all cpufreq drivers support the ondemand
	  governor. If unsure have a look at the help section of the
	  driver. Fallback governor will be the performance governor.

config CPU_FREQ_DEFAULT_GOV_CONSERVATIVE
	bool "conservative"
	select CPU_FREQ_GOV_CONSERVATIVE
	select CPU_FREQ_GOV_PERFORMANCE
	help
	  Use the CPUFreq governor 'conservative' as default. This allows
	  you to get a full dynamic frequency capable system by simply
	  loading your cpufreq low-level hardware driver.
	  Be aware that not all cpufreq drivers support the conservative
	  governor. If unsure have a look at the help section of the
	  driver. Fallback governor will be the performance governor.
endchoice

config CPU_FREQ_GOV_PERFORMANCE
	tristate "'performance' governor"
	help
	  This cpufreq governor sets the frequency statically to the
	  highest available CPU frequency.

	  To compile this driver as a module, choose M here: the
	  module will be called cpufreq_performance.

	  If in doubt, say Y.

config CPU_FREQ_GOV_POWERSAVE
	tristate "'powersave' governor"
	help
	  This cpufreq governor sets the frequency statically to the
	  lowest available CPU frequency.

	  To compile this driver as a module, choose M here: the
	  module will be called cpufreq_powersave.

	  If in doubt, say Y.

config CPU_FREQ_GOV_USERSPACE
	tristate "'userspace' governor for userspace frequency scaling"
	help
	  Enable this cpufreq governor when you either want to set the
	  CPU frequency manually or when a userspace program shall
	  be able to set the CPU dynamically, like on LART 
	  <http://www.lartmaker.nl/>.

	  To compile this driver as a module, choose M here: the
	  module will be called cpufreq_userspace.

	  For details, take a look at <file:Documentation/cpu-freq/>.

	  If in doubt, say Y.

config CPU_FREQ_GOV_ONDEMAND
	tristate "'ondemand' cpufreq policy governor"
	select CPU_FREQ_GOV_COMMON
	help
	  'ondemand' - This driver adds a dynamic cpufreq policy governor.
	  The governor does a periodic polling and 
	  changes frequency based on the CPU utilization.
	  The support for this governor depends on CPU capability to
	  do fast frequency switching (i.e, very low latency frequency
	  transitions). 

	  To compile this driver as a module, choose M here: the
	  module will be called cpufreq_ondemand.

	  For details, take a look at linux/Documentation/cpu-freq.

	  If in doubt, say N.

config CPU_FREQ_GOV_CONSERVATIVE
	tristate "'conservative' cpufreq governor"
	depends on CPU_FREQ
	select CPU_FREQ_GOV_COMMON
	help
	  'conservative' - this driver is rather similar to the 'ondemand'
	  governor both in its source code and its purpose, the difference is
	  its optimisation for better suitability in a battery powered
	  environment.  The frequency is gracefully increased and decreased
	  rather than jumping to 100% when speed is required.

	  If you have a desktop machine then you should really be considering
	  the 'ondemand' governor instead, however if you are using a laptop,
	  PDA or even an AMD64 based computer (due to the unacceptable
	  step-by-step latency issues between the minimum and maximum frequency
	  transitions in the CPU) you will probably want to use this governor.

	  To compile this driver as a module, choose M here: the
	  module will be called cpufreq_conservative.

	  For details, take a look at linux/Documentation/cpu-freq.

	  If in doubt, say N.

comment "CPU frequency scaling drivers"

config CPUFREQ_DT
	tristate "Generic DT based cpufreq driver"
	depends on HAVE_CLK && OF
	# if CPU_THERMAL is on and THERMAL=m, CPUFREQ_DT cannot be =y:
	depends on !CPU_THERMAL || THERMAL
	select PM_OPP
	help
	  This adds a generic DT based cpufreq driver for frequency management.
	  It supports both uniprocessor (UP) and symmetric multiprocessor (SMP)
	  systems which share clock and voltage across all CPUs.

	  If in doubt, say N.

if X86
source "drivers/cpufreq/Kconfig.x86"
endif

if ARM || ARM64
source "drivers/cpufreq/Kconfig.arm"
endif

if PPC32 || PPC64
source "drivers/cpufreq/Kconfig.powerpc"
endif

if AVR32
config AVR32_AT32AP_CPUFREQ
	bool "CPU frequency driver for AT32AP"
	depends on PLATFORM_AT32AP
	default n
	help
	  This enables the CPU frequency driver for AT32AP processors.
	  If in doubt, say N.
endif

if IA64
config IA64_ACPI_CPUFREQ
	tristate "ACPI Processor P-States driver"
	depends on ACPI_PROCESSOR
	help
	This driver adds a CPUFreq driver which utilizes the ACPI
	Processor Performance States.

	For details, take a look at <file:Documentation/cpu-freq/>.

	If in doubt, say N.
endif

if MIPS
config LOONGSON2_CPUFREQ
	tristate "Loongson2 CPUFreq Driver"
	help
	  This option adds a CPUFreq driver for loongson processors which
	  support software configurable cpu frequency.

	  Loongson2F and it's successors support this feature.

	  For details, take a look at <file:Documentation/cpu-freq/>.

	  If in doubt, say N.

config LOONGSON1_CPUFREQ
	tristate "Loongson1 CPUFreq Driver"
	help
	  This option adds a CPUFreq driver for loongson1 processors which
	  support software configurable cpu frequency.

	  For details, take a look at <file:Documentation/cpu-freq/>.

	  If in doubt, say N.
endif

if SPARC64
config SPARC_US3_CPUFREQ
	tristate "UltraSPARC-III CPU Frequency driver"
	help
	  This adds the CPUFreq driver for UltraSPARC-III processors.

	  For details, take a look at <file:Documentation/cpu-freq>.

	  If in doubt, say N.

config SPARC_US2E_CPUFREQ
	tristate "UltraSPARC-IIe CPU Frequency driver"
	help
	  This adds the CPUFreq driver for UltraSPARC-IIe processors.

	  For details, take a look at <file:Documentation/cpu-freq>.

	  If in doubt, say N.
endif

if SUPERH
config SH_CPU_FREQ
	tristate "SuperH CPU Frequency driver"
	help
	  This adds the cpufreq driver for SuperH. Any CPU that supports
	  clock rate rounding through the clock framework can use this
	  driver. While it will make the kernel slightly larger, this is
	  harmless for CPUs that don't support rate rounding. The driver
	  will also generate a notice in the boot log before disabling
	  itself if the CPU in question is not capable of rate rounding.

	  For details, take a look at <file:Documentation/cpu-freq>.

	  If unsure, say N.
endif

config QORIQ_CPUFREQ
	tristate "CPU frequency scaling driver for Freescale QorIQ SoCs"
	depends on OF && COMMON_CLK && (PPC_E500MC || ARM)
	select CLK_QORIQ
	help
	  This adds the CPUFreq driver support for Freescale QorIQ SoCs
	  which are capable of changing the CPU's frequency dynamically.

endif
endmenu
Commit	Line	Data
bb0a56ec DJ	1	menu "CPU Frequency scaling"
bb0a56ec DJ	2
1da177e4 LT	3	config CPU_FREQ
1da177e4 LT	4	bool "CPU Frequency scaling"
83fe27ea	5	select SRCU
1da177e4 LT	6	help
	7	CPU Frequency scaling allows you to change the clock speed of
	8	CPUs on the fly. This is a nice method to save power, because
	9	the lower the CPU clock speed, the less power the CPU consumes.
	10
	11	Note that this driver doesn't automatically change the CPU
	12	clock speed, you need to either enable a dynamic cpufreq governor
	13	(see below) after boot, or use a userspace tool.
	14
	15	For details, take a look at <file:Documentation/cpu-freq>.
	16
	17	If in doubt, say N.
	18
	19	if CPU_FREQ
	20
1e15f295 LF	21	config CPU_FREQ_GOV_COMMON
	22	bool
	23
2fb4719b LM	24	config CPU_FREQ_BOOST_SW
	25	bool
	26	depends on THERMAL
	27
1da177e4	28	config CPU_FREQ_STAT
9101be53	29	tristate "CPU frequency translation statistics"
9101be53 MF	30	default y
	31	help
	32	This driver exports CPU frequency statistics information through sysfs
	33	file system.
	34
	35	To compile this driver as a module, choose M here: the
	36	module will be called cpufreq_stats.
	37
	38	If in doubt, say N.
1da177e4 LT	39
1da177e4 LT	40	config CPU_FREQ_STAT_DETAILS
9101be53 MF	41	bool "CPU frequency translation statistics details"
	42	depends on CPU_FREQ_STAT
	43	help
	44	This will show detail CPU frequency translation table in sysfs file
	45	system.
	46
	47	If in doubt, say N.
1da177e4 LT	48
	49	choice
	50	prompt "Default CPUFreq governor"
559f56c7	51	default CPU_FREQ_DEFAULT_GOV_USERSPACE if ARM_SA1100_CPUFREQ \|\| ARM_SA1110_CPUFREQ
1da177e4 LT	52	default CPU_FREQ_DEFAULT_GOV_PERFORMANCE
	53	help
	54	This option sets which CPUFreq governor shall be loaded at
	55	startup. If in doubt, select 'performance'.
	56
	57	config CPU_FREQ_DEFAULT_GOV_PERFORMANCE
	58	bool "performance"
	59	select CPU_FREQ_GOV_PERFORMANCE
	60	help
	61	Use the CPUFreq governor 'performance' as default. This sets
	62	the frequency statically to the highest frequency supported by
	63	the CPU.
	64
30d221db AG	65	config CPU_FREQ_DEFAULT_GOV_POWERSAVE
30d221db AG	66	bool "powersave"
30d221db AG	67	select CPU_FREQ_GOV_POWERSAVE
	68	help
	69	Use the CPUFreq governor 'powersave' as default. This sets
	70	the frequency statically to the lowest frequency supported by
	71	the CPU.
	72
1da177e4 LT	73	config CPU_FREQ_DEFAULT_GOV_USERSPACE
	74	bool "userspace"
	75	select CPU_FREQ_GOV_USERSPACE
	76	help
	77	Use the CPUFreq governor 'userspace' as default. This allows
0211a9c8	78	you to set the CPU frequency manually or when a userspace
1da177e4 LT	79	program shall be able to set the CPU dynamically without having
	80	to enable the userspace governor manually.
	81
1c256245 TR	82	config CPU_FREQ_DEFAULT_GOV_ONDEMAND
	83	bool "ondemand"
	84	select CPU_FREQ_GOV_ONDEMAND
	85	select CPU_FREQ_GOV_PERFORMANCE
	86	help
	87	Use the CPUFreq governor 'ondemand' as default. This allows
	88	you to get a full dynamic frequency capable system by simply
	89	loading your cpufreq low-level hardware driver.
	90	Be aware that not all cpufreq drivers support the ondemand
	91	governor. If unsure have a look at the help section of the
	92	driver. Fallback governor will be the performance governor.
	93
	94	config CPU_FREQ_DEFAULT_GOV_CONSERVATIVE
	95	bool "conservative"
	96	select CPU_FREQ_GOV_CONSERVATIVE
	97	select CPU_FREQ_GOV_PERFORMANCE
	98	help
	99	Use the CPUFreq governor 'conservative' as default. This allows
	100	you to get a full dynamic frequency capable system by simply
	101	loading your cpufreq low-level hardware driver.
	102	Be aware that not all cpufreq drivers support the conservative
	103	governor. If unsure have a look at the help section of the
	104	driver. Fallback governor will be the performance governor.
1da177e4 LT	105	endchoice
	106
	107	config CPU_FREQ_GOV_PERFORMANCE
9101be53 MF	108	tristate "'performance' governor"
9101be53 MF	109	help
1da177e4 LT	110	This cpufreq governor sets the frequency statically to the
	111	highest available CPU frequency.
	112
9101be53 MF	113	To compile this driver as a module, choose M here: the
	114	module will be called cpufreq_performance.
	115
1da177e4 LT	116	If in doubt, say Y.
	117
	118	config CPU_FREQ_GOV_POWERSAVE
9101be53 MF	119	tristate "'powersave' governor"
9101be53 MF	120	help
1da177e4 LT	121	This cpufreq governor sets the frequency statically to the
	122	lowest available CPU frequency.
	123
9101be53 MF	124	To compile this driver as a module, choose M here: the
	125	module will be called cpufreq_powersave.
	126
1da177e4 LT	127	If in doubt, say Y.
	128
	129	config CPU_FREQ_GOV_USERSPACE
9101be53 MF	130	tristate "'userspace' governor for userspace frequency scaling"
9101be53 MF	131	help
1da177e4	132	Enable this cpufreq governor when you either want to set the
0211a9c8	133	CPU frequency manually or when a userspace program shall
1da177e4	134	be able to set the CPU dynamically, like on LART
4c41251e	135	<http://www.lartmaker.nl/>.
1da177e4	136
9101be53 MF	137	To compile this driver as a module, choose M here: the
	138	module will be called cpufreq_userspace.
	139
1da177e4 LT	140	For details, take a look at <file:Documentation/cpu-freq/>.
	141
	142	If in doubt, say Y.
	143
	144	config CPU_FREQ_GOV_ONDEMAND
	145	tristate "'ondemand' cpufreq policy governor"
1e15f295	146	select CPU_FREQ_GOV_COMMON
1da177e4 LT	147	help
	148	'ondemand' - This driver adds a dynamic cpufreq policy governor.
	149	The governor does a periodic polling and
	150	changes frequency based on the CPU utilization.
	151	The support for this governor depends on CPU capability to
	152	do fast frequency switching (i.e, very low latency frequency
	153	transitions).
	154
9101be53 MF	155	To compile this driver as a module, choose M here: the
	156	module will be called cpufreq_ondemand.
	157
1da177e4 LT	158	For details, take a look at linux/Documentation/cpu-freq.
	159
	160	If in doubt, say N.
	161
b9170836 DJ	162	config CPU_FREQ_GOV_CONSERVATIVE
	163	tristate "'conservative' cpufreq governor"
	164	depends on CPU_FREQ
1e15f295	165	select CPU_FREQ_GOV_COMMON
b9170836 DJ	166	help
	167	'conservative' - this driver is rather similar to the 'ondemand'
	168	governor both in its source code and its purpose, the difference is
	169	its optimisation for better suitability in a battery powered
	170	environment. The frequency is gracefully increased and decreased
	171	rather than jumping to 100% when speed is required.
	172
	173	If you have a desktop machine then you should really be considering
	174	the 'ondemand' governor instead, however if you are using a laptop,
	175	PDA or even an AMD64 based computer (due to the unacceptable
	176	step-by-step latency issues between the minimum and maximum frequency
	177	transitions in the CPU) you will probably want to use this governor.
	178
9101be53 MF	179	To compile this driver as a module, choose M here: the
	180	module will be called cpufreq_conservative.
	181
b9170836 DJ	182	For details, take a look at linux/Documentation/cpu-freq.
	183
	184	If in doubt, say N.
	185
f41f4815 VK	186	comment "CPU frequency scaling drivers"
f41f4815 VK	187
bbcf0719 VK	188	config CPUFREQ_DT
bbcf0719 VK	189	tristate "Generic DT based cpufreq driver"
5fbfbcd3	190	depends on HAVE_CLK && OF
bbcf0719	191	# if CPU_THERMAL is on and THERMAL=m, CPUFREQ_DT cannot be =y:
217886d3	192	depends on !CPU_THERMAL \|\| THERMAL
109df086	193	select PM_OPP
95ceafd4	194	help
bbcf0719	195	This adds a generic DT based cpufreq driver for frequency management.
95ceafd4 SG	196	It supports both uniprocessor (UP) and symmetric multiprocessor (SMP)
	197	systems which share clock and voltage across all CPUs.
	198
	199	If in doubt, say N.
	200
f41f4815	201	if X86
bb0a56ec	202	source "drivers/cpufreq/Kconfig.x86"
f41f4815	203	endif
bb0a56ec	204
f41f4815	205	if ARM \|\| ARM64
f7d77079	206	source "drivers/cpufreq/Kconfig.arm"
f41f4815	207	endif
f7d77079	208
f41f4815 VK	209	if PPC32 \|\| PPC64
	210	source "drivers/cpufreq/Kconfig.powerpc"
	211	endif
81c720c9	212
f41f4815	213	if AVR32
81c720c9 VK	214	config AVR32_AT32AP_CPUFREQ
	215	bool "CPU frequency driver for AT32AP"
	216	depends on PLATFORM_AT32AP
	217	default n
	218	help
	219	This enables the CPU frequency driver for AT32AP processors.
	220	If in doubt, say N.
f41f4815	221	endif
81c720c9	222
f41f4815	223	if IA64
ab423e43 VK	224	config IA64_ACPI_CPUFREQ
ab423e43 VK	225	tristate "ACPI Processor P-States driver"
ab423e43 VK	226	depends on ACPI_PROCESSOR
	227	help
	228	This driver adds a CPUFreq driver which utilizes the ACPI
	229	Processor Performance States.
	230
	231	For details, take a look at <file:Documentation/cpu-freq/>.
	232
	233	If in doubt, say N.
f41f4815	234	endif
ab423e43	235
f41f4815	236	if MIPS
7a998935 VK	237	config LOONGSON2_CPUFREQ
7a998935 VK	238	tristate "Loongson2 CPUFreq Driver"
7a998935 VK	239	help
	240	This option adds a CPUFreq driver for loongson processors which
	241	support software configurable cpu frequency.
	242
	243	Loongson2F and it's successors support this feature.
	244
	245	For details, take a look at <file:Documentation/cpu-freq/>.
	246
	247	If in doubt, say N.
	248
a0a22cf1 KC	249	config LOONGSON1_CPUFREQ
	250	tristate "Loongson1 CPUFreq Driver"
	251	help
	252	This option adds a CPUFreq driver for loongson1 processors which
	253	support software configurable cpu frequency.
	254
	255	For details, take a look at <file:Documentation/cpu-freq/>.
	256
	257	If in doubt, say N.
f41f4815	258	endif
a0a22cf1	259
f41f4815	260	if SPARC64
764295ae VK	261	config SPARC_US3_CPUFREQ
764295ae VK	262	tristate "UltraSPARC-III CPU Frequency driver"
764295ae VK	263	help
	264	This adds the CPUFreq driver for UltraSPARC-III processors.
	265
	266	For details, take a look at <file:Documentation/cpu-freq>.
	267
	268	If in doubt, say N.
	269
	270	config SPARC_US2E_CPUFREQ
	271	tristate "UltraSPARC-IIe CPU Frequency driver"
764295ae VK	272	help
	273	This adds the CPUFreq driver for UltraSPARC-IIe processors.
	274
	275	For details, take a look at <file:Documentation/cpu-freq>.
	276
	277	If in doubt, say N.
f41f4815	278	endif
764295ae	279
f41f4815	280	if SUPERH
7258267e VK	281	config SH_CPU_FREQ
7258267e VK	282	tristate "SuperH CPU Frequency driver"
7258267e VK	283	help
	284	This adds the cpufreq driver for SuperH. Any CPU that supports
	285	clock rate rounding through the clock framework can use this
	286	driver. While it will make the kernel slightly larger, this is
	287	harmless for CPUs that don't support rate rounding. The driver
	288	will also generate a notice in the boot log before disabling
	289	itself if the CPU in question is not capable of rate rounding.
	290
	291	For details, take a look at <file:Documentation/cpu-freq>.
	292
	293	If unsure, say N.
f41f4815	294	endif
7258267e	295
2f249358 TY	296	config QORIQ_CPUFREQ
	297	tristate "CPU frequency scaling driver for Freescale QorIQ SoCs"
	298	depends on OF && COMMON_CLK && (PPC_E500MC \|\| ARM)
	299	select CLK_QORIQ
	300	help
	301	This adds the CPUFreq driver support for Freescale QorIQ SoCs
	302	which are capable of changing the CPU's frequency dynamically.
	303
bb0a56ec DJ	304	endif
bb0a56ec DJ	305	endmenu